Rails 4 - 创建一个按钮以向用户 onclick 发送电子邮件

Question

我想创建一个在按下时向用户发送电子邮件的按钮 - 所以我使用了 ActionMailer - http://guides.rubyonrails.org/action_mailer_basics.html#sending-emails 如第 2 节到第 2.1.4 节所述，我创建了：

app/mailers/user_mailer.rb

class UserMailer < ActionMailer::Base
default from: 'myemail@gmail.com'
end

def send_email(user)
  @user = user
  @url  = 'http://example.com/login'
  mail(to: @user.email, subject: 'You receive this email because you click on the btn)
 end
end

所以在这里我不知道在 @url 中输入什么值？

然后我为我的电子邮件创建了一个视图 - 但我不知道在我的用户模型中调用什么来告诉它在用户单击按钮时发送电子邮件，这是我的 app/controllers/user_controller .rb

class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]
  # GET /users
  # GET /users.json
  def index
    @users = User.all
    @users = User.paginate(:page => params[:page], :per_page => 50)
  end

  # GET /users/1
  # GET /users/1.json
  def show
    @user = User.find(params[:id])
  end

  # GET /users/new
  def new
    @user = User.new
  end

  # GET /users/1/edit
  def edit
  end

  # POST /users
  # POST /users.json
  def create
    @user = User.new(user_params)

    respond_to do |format|
      if @user.save
        format.html { redirect_to @user, notice: 'User was successfully created.' }
        format.json { render action: 'show', status: :created, location: @user }
      else
        format.html { render action: 'new' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /users/1
  # PATCH/PUT /users/1.json
  def update
    respond_to do |format|
      if @user.update(user_params)
        format.html { redirect_to @user, notice: 'User was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /users/1
  # DELETE /users/1.json


  private
    # Use callbacks to share common setup or constraints between actions.
    def set_user
      @user = User.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def user_params
      params[:user]
    end


   def self.find_for_facebook_oauth(auth)
  where(auth.slice(:provider, :uid)).first_or_create do |user|
    user.provider = auth.provider
    user.uid = auth.uid
    user.email = auth.info.email
    user.password = Devise.friendly_token[0,20]
    user.name = auth.info.name   # assuming the user model has a name
    user.image = auth.info.image # assuming the user model has an image
  end
end


end

现在，在我看来，我希望用户在单击此按钮时收到一封电子邮件-

<button class="btn btn-default" type="button">Get my reward</button>

Answer 1

从User 模型，您可以调用UserMailer.send_email(self)。您可以将其放入一个方法中并使用after_save 回调调用该方法，以便在User 更新他/她的个人资料时发送电子邮件。